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Pens

Price

  • Bluelab pH Pen

    Original price $119.00 - Original price $119.00
    Original price
    $119.00
    $119.00 - $119.00
    Current price $119.00

    Original price $119.00 - Original price $119.00
    Original price
    $119.00
    $119.00 - $119.00
    Current price $119.00
  • Bluelab PPM Pen

    Original price $99.00 - Original price $99.00
    Original price
    $99.00
    $99.00 - $99.00
    Current price $99.00

    Original price $99.00 - Original price $99.00
    Original price
    $99.00
    $99.00 - $99.00
    Current price $99.00
  • Out of Stock

    Oakton Waterproof EcoTestr pH 1

    Original price $77.02
    Original price $77.02 - Original price $77.02
    Original price $77.02
    Current price $45.95
    $45.95 - $45.95
    Current price $45.95

    Original price $77.02
    Original price $77.02 - Original price $77.02
    Original price $77.02
    Current price $45.95
    $45.95 - $45.95
    Current price $45.95
    Out of Stock
  • Bluelab Soil pH Pen

    Original price $190.99 - Original price $190.99
    Original price
    $190.99
    $190.99 - $190.99
    Current price $190.99

    Original price $190.99 - Original price $190.99
    Original price
    $190.99
    $190.99 - $190.99
    Current price $190.99
  • Out of Stock

    Rapitest Mini pH Tester

    Original price $6.30 - Original price $6.30
    Original price
    $6.30
    $6.30 - $6.30
    Current price $6.30

    Original price $6.30 - Original price $6.30
    Original price
    $6.30
    $6.30 - $6.30
    Current price $6.30
    Out of Stock
  • Out of Stock

    Rapitest Soil Test pH N,P,K (6-Cs)

    Original price $13.99 - Original price $13.99
    Original price
    $13.99
    $13.99 - $13.99
    Current price $13.99

    Original price $13.99 - Original price $13.99
    Original price
    $13.99
    $13.99 - $13.99
    Current price $13.99
    Out of Stock
  • Out of Stock

    Rapitest pH Soil Tester (12-Cs)

    Original price $4.49
    Original price $4.49 - Original price $4.49
    Original price $4.49
    Current price $4.33
    $4.33 - $4.33
    Current price $4.33

    Original price $4.49
    Original price $4.49 - Original price $4.49
    Original price $4.49
    Current price $4.33
    $4.33 - $4.33
    Current price $4.33
    Out of Stock
  • Out of Stock

    Luster Leaf Rapitest 4 Way Analyzer (3-Cs)

    Original price $27.99 - Original price $27.99
    Original price
    $27.99
    $27.99 - $27.99
    Current price $27.99

    Original price $27.99 - Original price $27.99
    Original price
    $27.99
    $27.99 - $27.99
    Current price $27.99
    Out of Stock
  • FALSE
    Out of Stock

    Sure Test Base pH Pen +-- 0.3

    Original price $33.99 - Original price $33.99
    Original price
    $33.99
    $33.99 - $33.99
    Current price $33.99

    Original price $33.99 - Original price $33.99
    Original price
    $33.99
    $33.99 - $33.99
    Current price $33.99
    Out of Stock
  • Out of Stock

    Oakton Waterproof EcoTestr pH 2

    Original price $68.32 - Original price $68.32
    Original price
    $68.32
    $68.32 - $68.32
    Current price $68.32

    Original price $68.32 - Original price $68.32
    Original price
    $68.32
    $68.32 - $68.32
    Current price $68.32
    Out of Stock
  • FALSE
    Out of Stock

    Sure Test Commercial pH - EC - TDS - ORP Lab Meter

    Original price $356.99 - Original price $356.99
    Original price
    $356.99
    $356.99 - $356.99
    Current price $356.99

    Original price $356.99 - Original price $356.99
    Original price
    $356.99
    $356.99 - $356.99
    Current price $356.99
    Out of Stock
  • FALSE
    Out of Stock

    Sure Test Pro EC - TDS Pen

    Original price $24.99 - Original price $24.99
    Original price
    $24.99
    $24.99 - $24.99
    Current price $24.99

    Original price $24.99 - Original price $24.99
    Original price
    $24.99
    $24.99 - $24.99
    Current price $24.99
    Out of Stock
  • FALSE
    Out of Stock

    Sure Test Pro pH Pen w- Replaceable Probe +-- 0.05 ATC

    Original price $78.99 - Original price $78.99
    Original price
    $78.99
    $78.99 - $78.99
    Current price $78.99

    Original price $78.99 - Original price $78.99
    Original price
    $78.99
    $78.99 - $78.99
    Current price $78.99
    Out of Stock
  • FALSE
    Out of Stock

    Sure Test Base Plus pH Pen +-- 0.05 ATC

    Original price $28.99 - Original price $28.99
    Original price
    $28.99
    $28.99 - $28.99
    Current price $28.99

    Original price $28.99 - Original price $28.99
    Original price
    $28.99
    $28.99 - $28.99
    Current price $28.99
    Out of Stock
  • Out of Stock

    Sure Test Commercial Multi-Meter w- pH Conductivity Probes (DO Probe Sold Separately)

    Original price $106.99 - Original price $106.99
    Original price
    $106.99
    $106.99 - $106.99
    Current price $106.99

    Original price $106.99 - Original price $106.99
    Original price
    $106.99
    $106.99 - $106.99
    Current price $106.99
    Out of Stock
  • FALSE
    Out of Stock

    HM Digital Brix Refractometer

    Original price $231.09 - Original price $231.09
    Original price
    $231.09
    $231.09 - $231.09
    Current price $231.09

    Special order item; may take up to two weeks before it ships.

    Original price $231.09 - Original price $231.09
    Original price
    $231.09
    $231.09 - $231.09
    Current price $231.09
    Out of Stock
  • Out of Stock

    Oakton Waterproof EcoTester pH 2+

    Original price $68.02 - Original price $68.02
    Original price
    $68.02
    $68.02 - $68.02
    Current price $68.02

    Original price $68.02 - Original price $68.02
    Original price
    $68.02
    $68.02 - $68.02
    Current price $68.02
    Out of Stock
  • Out of Stock

    Milwaukee pH Controller

    Original price $161.99 - Original price $161.99
    Original price
    $161.99
    $161.99 - $161.99
    Current price $161.99

    Original price $161.99 - Original price $161.99
    Original price
    $161.99
    $161.99 - $161.99
    Current price $161.99
    Out of Stock
  • Out of Stock

    Oakton Waterproof EcoTestr TDS Low

    Original price $65.27 - Original price $65.27
    Original price
    $65.27
    $65.27 - $65.27
    Current price $65.27

    Original price $65.27 - Original price $65.27
    Original price
    $65.27
    $65.27 - $65.27
    Current price $65.27
    Out of Stock

Pens and Green Houses Benefits

Pen like pH or TDS testers are easy to use and calibrate. They are sensitive to small changes and can be carried in pocket easily to any place. EC hydroponics is good way to ensure good growth in plants, you can also compare using EC vs PPM to check what works better for your hydroponic garden. Pick from our selection of high quality, water proof pens from brands such as HM Digital and Oakton. Zenhydro offers discount pens online, waterproof hydroponic pens, EC pen, advanced nutrients PPM scale, hydroponic EC and many more. Check out today.